Later model axle swaps have been done on 49-54 Chevy's without the need for changing leaf springs. You can add traction bars to eliminate leaf spring bending on acceleration. However you would need to include a floater kit to retain a stock ride.
The other option is to go with a 4 link suspension and eliminate the leaf springs all together.
1951 Chevrolet Sport Coupe 235 4 barrel 4spd
1954 Chevrolet 2dr Sedan Highboy 350 V8 set back 20% tilt front end '57 Olds rear 7" lift to front susp.
1955 Chevrolet 2dr Hardtop Highboy Olds tripower engine 4spd
1970 Corvette Stingray convertible
Edited by High5 on 01-18-22 07:14 PM. Reason for edit: No reason given.