Help me please tryin to beef up 318

I would also advise against the 360 heads on a 318. Not only will they lower the compression but they will also cut down the flow because of valve shrouding which means you would also need to notch the cylinder walls in addition to milling the heads and intake. I would suggest the 302 casting 318 heads that were made in the very late 80s. They have a closed chamber which would raise the compression and if you could get somebody to port and polish them they are some of the best flowing of all the LA heads.

Honestly though, if you really want to increase power there is no substitute for cubic inches...like a 360 magnum perhaps. Or you could use NOS. That would blow the stangs doors off. Probably blow your engine up too but it would be fun for a short period of time.