[Kenth]

This is what i´ve found in 1967, 1970 and 1971 MPC´s:

1965-66 389/421 HO uses gasket #9772289 (.028"/.033" thick).
1965-66 389/421 non-HO uses gasket #542973 (.040"/.045" thick).

1967 T/8 400 or P/8 HO uses gasket #9788026 (.028/.033" thick).
1967 F/8-T/8 400 std. and P/8 400 exc. G.P.-4B.C. w/1st type cylinder head and P/8 428 H.O. uses gasket #9785654 (.040"/.045" thick).
1967 P/8 400 G.P. 4 B.C and P/8 400 G.P.-4B.C. w/2nd type cylinder heads and P/8 428 exc. H.O. uses gasket #9787642.

1968 F/8-T/8 400 4bbl/428 HO uses gasket #9792995 (.028/.033" thick).
1968 T/8-P/8-400-exc. G.P.-4B.C. uses gasket #9790910 (.040/.045" thick).
1968 P/8 400 G.P.-4B.C. uses gasket #9790911 (.055"/.060" thick).

1969 All 400 (2B.C.) and F/8-T/8 Ram Air-III, IV or H.O. and P/8/GP/8 428 uses gasket #9790910.
1969-70 All 400 4B.C./428&H.O. uses gasket #9792995.

1970 All V/8 400 (exc. 8.6 ratio) uses gasket #9790910.
1970 455 (YH) uses gasket #545055 (.040"/.045" thick).
1970 All 455 (exc. YH) uses gasket #9792995.

1971-72 All 400 gasket #9790911.
1971-72 All 455 gasket #484351.

1973-76 455 uses gasket #488575 (.050"/.055" thick).

FWIW