[blykins]

As far as cylinder heads go, you're pretty limited. You can either go with out of the box pieces, or have them worked on.

It all depends on how much power you want to make. A good rule of thumb is that you can multiply your cfm by 2 and figure out how much horsepower you can make if everything else is kosher. Out of the box Edelbrocks flow about 265-270cfm. So you have the potential of making 530-540hp if your cam and intake selection is good.

Until you make a cylinder head choice, it's kinda hard to recommend a valve spring. There are several variables in choosing a spring (knowing the install height, spring pocket diameter, etc.) that I'd have to know before I could make a choice. Even if you call Comp or Keith Craft, they'd have to know those variables.

With 390ci and a 230 duration @ .050" cam, I'd guess your hp peak would be at around 5800-6000rpm. With a hydraulic roller, I'd choose springs that will give you about 150lbs seat pressure and about 400 lbs open pressure. A little higher spring pressure won't hurt a hydraulic roller lifter and I like to eliminate all chances of valve float at the peak hp rpm's.

Rick Lake's got a good point on using beehive springs. However, you'll find that they're more expensive and it's somewhat more difficult to find the pressures that you need at the correct install heights.

I just went through this process with my SBF TW-R heads. The only beehives I could find (without shimming the crap out of them) were up around $300 for the springs alone. I decided to go with good dual springs and titanium retainers to help keep the weight down.

Call Barry Rabotnick at Survival Motorsports. He'll fix you up with a set of heads that will fit your budget. He could also set them up with springs to match your cam for you, since he will know the install heights.