170 vs. 225
I cannot offer any advice to boost-- I can however tell you a 225 hands down smokes a 170 for breakaway performance.
I had a 1962 valiant 170 push button traffic-- could not get inot traffic in Wichita Ks--(flat) swapped in the 225(used low mileage engine) car ran totally different. I only changed the exhaust to mate up to the taller point-- used the same ignition & carb set-up (carter 1bbl & petronix).
vast improvement -- easily entered into traffic after the swap.
Car is still driven today.
Lawrence