[johnswart]

i have a 454 engine 1975 to 1980 and my exhaust manfold are realy bad what other engine manfold will fit

 

[Guy Hiltz]

If you are looking for factory manifolds,the only ones that will fit are other big block manifolds,or aftermarket headers,some of which can be had fairly cheap,like these;
http://www.jegs.com/i/Dynomax/289/85110/10002/-1
Exhaust manifolds from other engine family's will not interchange onto your 454.
Guy