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Summit cams aren't bad cams, alot of them ar ehte tried and true grinds (204/214) , but there are alot of newer cams out there now that will do alot better. Try a comp cam xe grind or the new lunati voodoo series. The lobe profiles of those cams are great. I personally have a XE268H-10 in my monte which is my daily driver. And 89TransAmGTA is right 89 should be a roller motor and xe's and voodoo's are availible as rollers.
1986 Camaro Z28 - 350HSR/TH350/3.27
1988 Monte Carlo - 350/TH350/4.10
2006 Magnum - 5.7L/auto/3.06
2009 Challenger - 5.7L/T-56/3.92
I used the Summit TPI Cam in a 305 with SLP Runners. This was in an 86 non roller Block. With a Hypercrap Chip it ran very well, made a noticeable change in power and RPM range. Also changed the exhaust note. It was part of what I used to get a 305 to run 13.9 with a 2.77 rear end.
Do a search on the GM Hot Cam. Pretty healthy cam with near stock street manners. Not sure if you'll need some modifications for this though but lots of info available on this swap. About the best there is for a mild/stock engine from what I've read.