One problem you may encounter is that the 230/250 6 cylinder stick shift models of that era used a very small radiator. The 292 6 cyl and V-8 trucks not only came with a larger radiator but a different core support. That could become an issue considering you are also switching to an auto trans. Also, a shroud will likely be needed because of the distance between the fan and radiator.
Fred

Last edited by rfs56trk; 03/02/2015 5:12 PM.

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