Particularly TrickFlow heads. I've always liked the MUCH bigger selection for SBC valve covers in perimeter style bolt pattern. If you find anything cool for centerbolts, it'll be very expensive.

Anyway, today while I was taking a better look at my tricflow heads I noticed they have bosses for perimeter style valve covers! They're not drilled though. So I drilled them, tapped them, and voila! I can run BOTH types of valve covers on the same head w/out changing anything else. I went got me a nice set of black valve covers with red chevy logos on them from Summit and I'm a happy camper

My heads were originally ordered for centerbolt valve covers. I assume TrickFlow wont make two separate castings for two different valve cover designs, so they just NOT drill and tap those bosses if centerbolts are desired. I can only assume most other manufactures would do the same.

i just ordered a set of summit's cheapest centerbolt valve covers, they were $42 for plain chrome. If you want any design or what not it's gonnna be 100+. the magnesium vette covers my engine originally had are 180 from gm.

Well yeah... for cheap looking chrome covers. That's what I got and they look... cheap. For anything better then that you're looking 100+ like you said.

In the newest Summit catalog they have valve cover adapters for small Chevy so you can run perimeter style valve covers instead of center bolts. Its on page 10 and cost 60 bucks.