I would find a set of 62's to change on it. One thing about the 670's & 061's is they are the early big valve heads that utilizes a closed combustion chamber & a different valve angle. you would have to play close atention to the valve/piston clearances with any hi-perf cam. The 62 heads have a 75cc chamber & are open chamber heads, perfect for your engine. Will need to check valve clearance on the block to prevent bending a valve on the block near the piston bore. Keep the revs below 5800 rpm and you will be OK. If hi-perf rod bolts are in place , all the better. Don't get too wild on the cam but agree with Q, put some cam in it regardless. Stock intake & Q-jet for carb.
