ummm...
if you were to go 351 or 302 and making it worth while-
1. ensure its a 94-95 block for 302 if your staying with factory.
2. 351, going long block (cleveland) or short block (windsor)? big differences, not even sure if a cleveland would fit in the sn95's.
3. qa1 k member would be my choice for a k member to swap in, verse a factory one.
4. ford fuel injection makes a harness for classic mustangs efi swaps ($500'ish) probably make one to plug and play for your set up.
5. think of the engine internals- entirely to large for this reply and/or topic. search a little, figure what you want to make torque/hp wise first.
6. not alot of money would be spent, alot of time yes. i would look at a budget towards 5k. not alot, when you only play with cars every single day it doesnt seem like alot that is. I spent over 1500 in a roller block swap in a buddies 80 f100 (lots of sentimental value.)
7. bell housing has already been said. you can use a t5 from a fox for a t45 swap.
8. chat typing does sound ignorant, when your asking for help from a community of people. take the time to spell it out is what most are asking.