Help deciding between 750 mech and vac on my 454

[Harrison.]

I've got a 454 in my 70 c10 that I need to find a carb for. The engine came from a 78 suburban and is 30 over with stock heads, edelbrock rpm intake and aggressive cam. Unfortunately I don't know the specs on the cam (PO lost the cam card..and I bought the truck CHEAP..) but it's a very choppy idle. I do know that it's got a 3000 stall and 3.40 gears though. Right now it's got a holley 600 on it which seems undersized for the engine and I was planning on putting a holley 750 on it, only thing is I can't decide if I should be running a mechanical or vacuum secondary carb. I am not racing this truck, just beating around town in it. I've read the pros and cons in the article below, but the truck doesn't really seem to fit into either of those categories. What would best suit my application?

http://www.hotrod.com/pitstop/1306_v...etor_uses.html

Thanks