Do you plan on running a solid roller cam, or FT?
I like the edelbrock heads for road race because as mentioned there are alot of pro's, plus the valvetrain is less likely to be a problem over the highly offset W2 stuff.

How much power do you want/need? What are the rpm ranges you'll run (lowest and highest)?
How heavy is this car? I've seen short stroke engines kill bigger stroke stuff if done right.