Sometimes the answer for the choice of suppliers depends on the part you need. Some are stronger/weaker in different categories.

I have not used them all yet but based on my limited experience I like Chevs of the 40's the most and Jim Carter the least.

I hope this helps. Richard

1946 Chevy Half Ton
('56 235, '86 T5, '79 Camaro Z28 rear end, working on the '85 Jaguar XJ6 IFS)
1976 Margay Panther X, MC91B