It's a Pontiac engine, it's going to be fairly torquey as the bore is larger than the stroke. The small valve #46 heads are 350 2bbl/4bbl and 400 heads with about 86cc, 1.96/1.66" valves and pressed studs, according to my chart. The compression ratio will be reasonable for pump gas on a 400, but they won't breathe as well at high rpm as some others. They have D ports. Overall it would be a decent pump gas driver, not a screamer as equipped.

The price is great, and if you can hear it run you can make an informed decision. Either way, if it's someone else's rebuild, I'd go through it all before putting it in the car.