well i did not read your first post right .i was thinking you were trying to use a sbc fly wheel and stall to a 400 trans. but anyways it should bolt up to the fly wheel some gm fly wheels have two bolt patterns for the smaller stall core size and some did have only one but drilled two times on the fly wheel but only one size smaller size converter may not so this should be check .it could bolt up but its a 308 Holden ?