[chiphead]

I used to run a '67 400 block out of a Catalina. The thing to watch is the valve chamfers on the block. The '67 400 blocks have the valve chamfers at the top of the cylinders machined for the old 389 valve angle. At least on my block, that limited me to just over 550 lift with 670 heads. You should check how much valve travel it takes to hit the block before you select a camshaft.

For managing pump gas, select a cam with about a 225-228* intake lobe and 112-115* LSA. All the stock pontiac cams were on a wide LSA for a wide powerband and mild idle. Avoid fast ramp XE-type grinds with tight LSAs, they tend to want to detonate around 10:1 compression when combined with highway gears and tight converters or manual tranny.

Also consider the cost of converting the 62 heads to a roller cam. Sometimes longer valves and springs that set up at 1.7-1.8" IH are required for rollers. That can really add to the head cost vs a set of aftermarket heads ready to go.