[Lee H]

[Looking for a rough-sounding idle with good drivability.

350 (was a 1993 TBI truck engine) with stock bottom end, vortec heads, edelbrock performer intake, headers, 3.73 rear end, 4 speed manual, 600 CFM 4BBL

Would these cams work with the stock vortec heads and upgraded springs? Can I go bigger?]

Call one or two of the major cam manufacturers and let them recommend the right cam for your application. Be prepared to give them an honest assessment of what you will be doing with your truck. Other info they will need aside from the above includes type of 4 speed, tire size, power brakes?, type of driving the truck will mainly see. They will recommend a cam and the specs including the springs you need to run. You can then get a cam with those specs from who ever you want. For drivability bigger is not always better. You will end up losing low RPM torque and power and will not be a happy camper.