Need some suggestions
 

need some suggestions I want to do a motor swap on my 91z28 but I can't make up my mind on what to I want to take the factory 350 tune port out and put either a 383 stroker motor or a 502 done up but can't make up my mind any suggestions what do you think

What are your plans for the car? Daily driver, weekend cruiser, 1/4 miler, autocross, etc...That and local emissions laws will dictate your best choice. In general, the 383 route will be the cheapest (your stock block is fine to turn into a 383).

I drive the car as much as I can now and when I do the motor swap I'll drive it the same I want the car to be street and strip legal I've seen a few build with a 383 & 502 my main thing is I would like to keep it fuel injected because I'm not a big fan of carburaters

I have no idea what the emissions laws/inspection laws are like in RI. Here in central PA, they are pretty lax. You can get away with a lot. I would look into that before you do anything else. Unless you have a friend who will slap a sticker on it for you...

Here in RI they are pretty strict with inspections and all that the good thing is anything 25 years and older you only have to pass for safety no emissions so that helps me out a little bit

If that's the case, I would go 383. It will be easier to fit in there and you will have lots of options for headers, exhaust, accessories, etc (because the car came with a Gen I SBC). For fuel injection, I would go aftermarket. The stock computer is a bugger to tune (steep learning curve if you haven't ever messed with them).

Actually no I've never messed with them.....

I would put a ZZ6 GM Crate motor in it with Tuned Port Fuel Injection, but make sure you install a set of subframe connectors and and front and rear strut tower braces.