If I swap a 4.10 pumpkin out of a 66-73 chevy 3/4 ton to my 49 chevy 3/4 ton what would be my top highway speed with the original 216, 3 on the tree ?? Is this the way to go to get a comfortable 55-60 mph highway speed without harming my rebuilt 216? Or, I've also been told a rear axle swap from a 87-93 Ford E-250 Which is best?? I would like to stay as original looking as possible, but I want a daily driver. Thank You!