Re: 1961 305A vs 305D what is the difference?
When I had had my '60 3/4T step-side with a 305A for about five years in 1975, I met a guy with a the same setup in a fleet-side.
I had a one barrel and he had a two and it always ticked me off that I got 10 MPG and he got 15+.
On the bright side, mine still runs fine and regularly and his was junked 35 years ago.
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