I would start with the timing also. The 261 &292 use a carb with a larger bore. Often when someone exchanges it for a "rebuilt" carb they wind up with one from a 235. That will cut the power down. It might be jetted too lean.


They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.
1972 Chevy c10 Cheyenne Super
In the Gallery Forum