Des, since Im wanting an auto trans i think that means no XX block anyway whether 77 or 78 ,right?

Nope, the good XX W72 400 was available with automatic in 1978. Look for a Z code in the VIN. Avoid the 403 Olds engine (VIN CODE K) which was the default auto. engine unless you specifically ordered the W72 as an option. Blech. (Note: ALL 4-speed Trans Ams ordered with a Pontiac 400 in 1978 and 1979 got the good W72 400 Pontiac engine by default.)

Thanks. Yes heard the 403 was no good