IDK. flattie might fit, being the clearence issue comes with the heads/ intakes with inline engines.. being a flattie is shorter it 'might' fit... I know the SBC deffinetly won't.. not without changing the front suspension..

the only non stock ( 196 flathead/ OHV ) engine I know of fitting without issues is the Ford 144-250 I6 and that is because the integral heads provide enough clearence. also, if you have a 3spd manual, you can use the bellhousing for a '60-'63 Falcon I6 on the stock Rambler T-96 transmission, being the Falcon in those years also used the T-96