mustache man, doing an engine/trans swap is not a lifetime commitment. I was a 20 year old college kid when I got my '36 Chevy pickup in 1965. I swapped in a Chevy V8, B & M Hydrostick and 58 chevy pickup rear end and drove it like that for about 50,000 trouble free miles. Then in the early 70s I decided to restore it to all original condition and that was a total success. The 35 year old restoration still looks very presentable and we enjoy the '36 almost as much as our street roadster.
Bottom line, enjoy it-it's yours!