The 225 six brings up a point. I don't have any specs for the industrial version of that engine in terms of power output, but the 318 industrial was rated at 187 HP @ 4,000 RPM, and that's gross horsepower. In 1972 the Society of Automotive Engineers (SAE) changed the ratings to net horsepower which produces a lower number.
Looking at allpar.com the 225 was rated at 145 HP (gross, pre 1972) and 105 HP (net, 1972 and later). Using the 187 of the 318 and comparing it to the 145 number of the 225 that's a big hit; mathematically a reduction of 22.5% from the 318.
Tuckers aren't fast to begin with, but giving up that much power seems like a major handicap. Then let's throw in the physics of elevation changes... Horsepower ratings are corrected for sea level where the atmospheric pressure is greater. In a normally aspirated engine you lose approximately 3% of power for every 1,000 foot gain in elevation.
If you live at sea level - not a big deal. I live in Utah at an elevation of 7,200 feet. So performance wise a 318 V-8 at sea level would be like having a 225 I-6 in northern Utah. But starting with a 225 I-6 here is not something I'd want to do.