well thinking your getting a stall for under 450. and getting it tuned in to your build may not happen like many think as engine size moves up with all part being the same may be same part number. been here done it many times have spent $1000.s on stall s over the years. a part number for the 350 may still end up being the same converter for the 383 . many things come in to play .it has alot to do with the company core size will be the same .thats why you should call the converter company not the store you buy it from .they may work with you getting the rigth stator and core size . i use coan for customer builds and me .there converter are more money then most but you get what you pay for the one i have one that was 1200. and made for my car other was $700 10 years ago . i been threw many other makes over the years . i would not comment on them. but spent alot of money on busted junk