This is excerpted from an email sent to another engine-swapper. It
is regarding swapping an RB into a 64 Dodge that previously housed 
a Poly, and all the performance upgrades that went with it...
 
- I put a Performer RPM manifold and Edelbrock 800 carb mine, but it
stumbles off idle. I'm not sure what the problem is, but I might suggest
a Holley Double-Pumper 850 or 870 for yours. I may also need to upgrade
to bigger fuel lines.

- If you go with the Wilwood rears, you've got to do a bunch of
machining. I wound up buying new rear axles and doing alot of tinkering
to get it to function. I'm not sure it was worth it. The nice thing is
having an e-brake that really works, though. And you save some weight...

- I'm happy with the Randy's Ring & Pinion 742 rear I added. It has 3.55
gears and a Detroit Locker posi unit- supposedly much more durable than
the Suregrip. It cruises fine on the highway, even with the 3.55s. I've
hear people say the Det. Lockers are noisy, but, frankly I don't notice-
mostly because the whole damn car is noisy.

- Cooling was a major issue with mine. The stock radiators are simply
not enough. I finally gave up on mine and put a Be Cool aluminum
radiator in it. It now runs much cooler and with the recycling canister
it doesn't spit coolant on the ground when it's hot anymore. If you're
keeping the stock Poly radiator, you'll need a remote oil filter kit
because the radiator outlet is right where the filter is on a big block.

- If it's floor shift and you're keeping the original shifter, be sure
you've got the right 727. The floor shifters from 64 and 65 are
cable-actuated, so if the trans isn't from 64 or 65 AND from a
floor-shift car (pretty rare) you'll have to ditch the original shifter.
If it's a pushbutton, those tranys are easier to find, but they still
differ from the transmissions made after 64. There may be a way to rig
up a later model trans to a pushbutton, but I haven't heard of it. Oh,
and speedo pinion gears seem to be impossible to find in high (numeric)
ratios for these cars. My speedo is way off because it thinks I have the
old 2.93 gears. 

- Use a gear-reduction starter. I used my old starter on mine and a
backfire wound up ripping the starter out of my transmission- destroying
the flywheel, starter and transmission case in the process.

- If you're going to use it on the street, I'd stick with a low-stall
converter. Mine has a 3500, and unless you wind it up like crazy, it's
really not that much fun on the street.

- Traction and suspension becomes a pretty big issue with the extra
weight and power of a big block. I upgraded to thicker traction bars and
added some front a rear sway bars. I also replaced the rear springs,
adding an extra leaf and a half "traction leaf", as well as doing a
front-end rebuilt a few years ago. It's fairly stable, although you know
how these cars are- too much power and very little control.