Dangeous Doug Doug DEPENDING on the camshaft. You can go from a 1.6 to 1.7 ratio. Here's thing you need to check
Coil bind of the valve springs. I know guys running in the .060" clearance. IMO this is way to tight. Specs on most setup like to see .100" clearance. Running .080" is OK but over revving, missed shifts can bend pushrods and do other internal damage.
Rocker arms, spend the money and buy a good setup for your motor. Harland sharp, Jesel, PWR or T&D. Get full roller setups not just tips. Scorpions are made by Dove. Have seen 55 gallon drums of the them at the place last visit.
With running a higher lift rocker need to know if the valve has again enough clearance to not hit Mr. Piston. Again need about .080" clearance min.
Last Valve springs, can they control the added lift and rpm. Depend ing on the camshaft you are only talking about adding .020"-.050" total lift.
The other things are this. If you are looking for more power, start with porting and gasket matching heads to intake. Have the intake manifold flow tested and have all the ports matched for cfm's. Some manifolds are from 10-40 cfm off in range between cylinders. Joe Craine does a wonder ful job on this service.
Next exhaust, If you are running side pipes, the loss of 10-60 HP depend on size of motor. A higher flowing muffler is needed to get the added power you want. Down side is noise.
The last thing, Doug if you are happy with the way this motor runs and has power, leave it alone and built a PURPOSE BUILD motor for your crazyness. This way you have a spare bullet for your car. Shop hard, 302 are a dime a dozen. Best thing is to stroke one to a 347. This will wake up the car. Hope the driver is up on his game plan. Rick L.
Ps 4 info parts missing, max rpms of motor, size of camshaft, HP looking for, age of motor. Compression test and leak down of motor will tell you if it needs a rebuild. You might just need new valve springs. Some thing to think about.