Advice on which heads to use. 360 , 302???

Yeah, they are older 360 heads.. Open chamber... My motor is a 1990 318 truck motor.. Just put cam in today and replaced lifters, timing chain. I am not really sure you would call the springs dbl. They have a single "round" spring with a "flat" spring coiled inside.. They look just like the ones on the 360 heads actually... Just trying to get this together with minimal more cash out.. (employment ended in April) and just using my time to get parts I have assembled.. Just need to figure out the heads and then intake.. I have a stock cast 4bl. but seeing as I have a Holley carb, I would have to use an adapter.. Not sure of those things, but cheaper than an air-gap!!! Maybe I will just take the cam back out and install the stock roller cam and lifters for now... Just had to install the fuel pump ecentric,(SPELLING???).. so I thought I would change cam out.. Hate having new parts sitting on the shelf unused... haha