If you use the standard lifters, watch your oil pressure when autocrossing or consider a better oil pan with small kickouts.
A lot depends on your engine rpm's, length of straights, and rocker arm type.
I had oil pressure fluctuations on my 67 with stock rockers and mech lifters when autocrossing. I switched to the orifice type lifters that are supposed to reduce oil flow by 20% and had no more oil pressure problems when autocrossing.
Didn't have any valve spring problems when street driving either, but the orifice lifters supply less oil the more lift you have because the oil hole is exposed less time.
The Z/28 valve covers with cast in drippers are mandatory with the orifice lifters.
I see many vintage race vettes using a metal strap over the oil hole in the rocker to deflect oil to the rocker ball. They have to use stock type rockers, the grooved rocker balls are Legal.
You have the option of drilling the restrictors to get just what you want. I have no idea what size might work best though.
If you use roller rockers and the car will corner hard, the restrictors would make the most sense.
If you use stock rockers, have less than max cornering power, no restrictors might be best.
I know for sure the anti-pumpup type lifters are bad news, they pass too much oil to the top end and can starve the bottom end when cornering hard. If you have skinny tires, it's not so bad.
Check my web page for First Gen Camaro suspension info:
David's Motorsports page
First Gen Suspension Page
67 RS 327 original owner. 69 Camaro Vintage Racer, 65 Lola T-70 Chev SB Can-Am Vintage Racer