I've got a 781's for mine...781 or 049 seem to be the best stock
oval ports if you upgrade them to 2.19/1.88 valves. Based
on my research, these are the best bang for the buck street heads.
Although if you have to buy them, then pay for the machine work, you
start to get close to the price of aftermarket iron heads. THEN, if you're
going to lay out that kind of cash, why not just go aluminum?
At least this is the debate I'm having with myself right now...
Anyway, for big block info you should really check out the
Performance forum at [url]www.chevelles.com. Tons and tons of info.
Hope this helps,
Jason