Generally those side mount kits are used with a later auto trans whereby you cut out the existing rear crossmember and install a aftermarket crossmember with a mount on the tail shaft. It moves the engine forward a couple of inches and makes room for an HEI distributor. If your 4 speed has a rear mount you could do it this way. It just seems like a lot of cost & work with little gain.
Fred


1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine