The 228 used a 4 lb. cap. Modern V8s use 15 lb. or more. The higher the pressure, the higher the boiling point of water.

I don't know what pressure the 302 originally used so I can't make a recommendation.

"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.