302 shortblock question

i'm thinking with my tax return, looking at getting a used 302, to build up, while i'm currently driving my mustang with a 302 in it now.

my current engine has over 202,000 miles on it, if its the original engine.

What is needed if i use a majority of parts like the accessories and such of my engine now, just take the block from a used 302 and build up that.

can i just drop it in after build up and hook up my accesories, ecu and such?

I am on a tight budget, and I know 302s go real cheap in this area. there was a 1974 for 50 bucks on craigslist recently, could of bought an 80s one for 150 with 80,000 miles on it.

i figured i can buy the block now, and build it up and have it done before i start running into problems with my current engine. and be able to drop another engine right in, instead of taking the old one out, and building that up, then putting it in. no wait time really.

what should i look for to start with?

any good writeups online about building up 302s?

my brother had one in his stang that him and my father built, so its nothing new for my dad or brother if i need help.

i don't plan on putting out too much power, not enough to destroy the OEM block at least haha.

i'd like to put out like 400. of course when i get to 400, i may be singing a different tune.

i'm planning H/C/I, and and maybe, eventually a blower, depending on the money i have at that point.

this will be a daily driver, and the occasional track day.

yeah everything for the most part will be done myself, if not all. my dads a mechanic, so if i need help, i have someone there to guide me.

and first i was going to do H/C/I, maybe trickflow track heat set up.

if i wasn't satisfied with that, i would save up for a blower.