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Re: SO lets design a new exhaust....
I would say no more than 2 1/2" for the 307, but with an almost 400hp; at least 3" pipes.
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Love is fleeting, but Chevy trucks are forever!!!! 
1970 Chevy CST C10 long box 350/400 
2008 Chevy Silverado short box 4x4
Had;
1951 Chevy short box 307/T5
1988 Chevy shot box 4x4 350/350
1971 Chevy C10 long box 4x4 350/350
1971 Chevy C20 long box 350/350
1971 Chevy C10 long box 350/350
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