If a 30-31 Model A had a 28-29 radiator and grill shell, would a hood top fit? What about the hood sides? Would you have to use one particuler year group to have it work? are they interchangable??
No. IMHO Cowl on the 30-31 is a bigger radius. Also I think the 30-31 hood is an inch longer. Are the 28-29 is an inch shorter.
Measured down the middle of the hood top. 28-29 hoods are 27 3/4" 30-31 hoods are 31 5/8". 32 hoods are 32". You have to stick with the years noted for both hood tops and hood sides. Even if you moved the radiator and shell forward the 30-31 wouldn't fit the cowl on the 28-29's. Interestingly, ****pit measurements are virtually the same on all three series of cars with the major difference being the 32 ****pit is 2" deeper.
Run a 32 grill shell and a 31 radiator, all you do is trim the lower sides aboat an inch , and everthing else works, including a 30-31 hood.