RE: Better 235 cam
Get a NEW (not reground !) cam and lifters for a '58 ~ '62 261 engine from a C-60 Chevy , DO NOT use hydraulic lifters as they rob power .
You'll find this cam gives your old 235 quite a boost in power but still idles like a watch , it that same cam Chevy used in the early Corvette 235....
Prolly want to replace the cam and crank timing gears too , be sure to only buy timing gears of one brand as a few of them have come in with different pitch on the teeth...
Your local hot rod shop can easily polish the exhaust ports , and combustion chambers too , have them CC'd at the same time . perfectly smooth combustion chambers adds goodly bit of punch to it . have them
unshroud the valves and guides too . this will also increase fuel milage and allow the engine to run -much- cooler .
If they don't know what any of this means , it's a jerk off shop , not a hor rod machine shop as this is all basic stuff that really peps
up a stock engine .
-Nate