383 and 2" ex. pipes

The 383 can be built to give you all the power you want although I generly like small blocks in A bodies it's just easier to get everything hooked up. Mod it like a hot small block it likes to rev and the torque will surprise you. That being said if you want a big block go for it, if it's not a race car who cares. Once you get the big block in there you can build some wild stroker combos if thats what you want. As far as stock 340 dusters smoking 383 cars you have to remember they were normally installed in cars that weighted alot less and the 340's HP was very understated for insurance reasons. They made alot more then 45 HP more then a stock 230 HP 318. You can use the smaller exhaust and for street driving it will be ok but your going to want to upgrade that at some point as it will be a bottleneck. The 330 HP 383 was derated to 300 HP when installed in darts mainly due to exhaust issues.