Which heads wpuld be better?

I was orginally just going to go with the build up out of mopar muscle magazine but after i read more into it, it doesnt sound all that great. i want a 318 that i can race and be a street cruiser and survive.

I don't know what build your refering to. The 400 hp 318? It's a doable thing. IMO, a way to help this do double duty is a overdrive tranny. The 904 was given an addition to it's tail section and then called the 500. (A-500)
It is a little harder to install due to the larger rear section. According to those that have done it, a hammer to the rear side of the tunnel clears the way.

these magnum heads are they wut alot of ppl refer to as swirl heads? and how big are the valves in this heads? and they will have better compression then the older 360 heads?

Hum, I do not know for sure if they have the swirl tech built into them. The early 302's have it. The valves in the head are 1.94 or is it 1.92 intake and 1.65 exhaust. They should have a smaller cc chamber, but exactly the cc it has I forget. It should up the ratio easy.

Anybody out there remember the int. valve size and head cc amount?

The thing about Magnum heads are the rocker ratio is a 1.6 instead of a 1.5.
The valve train is held in by puny 5/16 threaded bolts, er studs like a Chevy. They can be upgraded to 3/8.

Read this when you have the time to help clear up some issues about the Magnum head. http://www.forabodiesonly.com/mopar/showthread.php?t=1924