Well you on the right train of thought.... but as far as the injection goes lets get real....

The stock maps were calibrated for a 350.....you just put in a bigger engine and unless the 383 has a less Bsfc than the 350..which it doesn't it's going to be lean......

The 383 move more air thru the engine than the 350 did..because it's bigger displacement....do you catch my drift?

You are not going to realize the "full" potential of the 383 until you chip the ECM....The nice people at www.jetchip.com and build you one...they are inexpensive and if you like you can visit there site and get the customer service number .....call them... tell them exactly what you have and what you did with the engine and they will hook you up....

Also if you have access to a SNAP-ON portable engine scanner ( the red one) this neat tool can actually LEARN the ECM to the new engine and reset it to new specs...only problem is with that unit...every time you disconnect the battery you'll have to do it again.....T