I stuffed a 327 small block Chevy into a 1952 MG-TD in the late 1960's. It ran pretty well until ethanol was added to the gas, lowering its boiling point. Now after the car has been run and is hot, then turned off, the carb boils dry, and re-starting is difficult when cold, almost impossible while hot. Modifications made aimed at this problem: re-core radiator, block heat riser passages in the intake manifold gasket, add biggest electric fan that would fit, add 160 degree thermostat, add phenolic spacers to move carb up, add heat insulation to steel gas line from the mechanical fuel pump to carb.
The hood must stay stock, although the heat problem is somewhat reduced when the car is run around without the hood.
I note that cars with fuel injection have similar problems, though not as bad. I want to stay with a carb. I am running a well-tuned Edelbrock.