double doot: if
https://www.enginefacts.com/chevrolet235/ is accurate, the 235 made 135 hp and 217 torque. But I have the 261, which enginefacts.com doesn't list the specs for. Regardless, if @panic's estimate of 152 hp is also accurate, the math still doesn't add up to a 70% increase as advertised. I was in the same boat you are in a few years back when I cracked my 235 & decided to upgrade to 261 & aftermarket package with Clifford; doesn't look like the extra money I spent paid off unfortunately
