The first 3 numbers on the boss behind the distributor will tell you if it's a 228 or 248.

I say keep it GMC.


"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.