I have an 81 with the 305/4sp. I am going to put a 454/T400 in it. Can anyone tell me what mounts to use? both motor and trans. Also will my stock transmission crossmember work?

you can use the mounts you have on the 305, you might wanna change the frame side mounts to new ones though..

you will need a TH-400 cross member..

Thank you, any suggestions on locating a T400 crossmember or can I find one aftermarket?

ask in the swapmeet section.. and look on ebay.. and you'll find one..

MonzaCam, What are you going to do with your manual transmission, bell housing, cluth assembly, pedals, etc?? Will they be for sale?

I have not even thought that far ahead yet, Its quite possible that I will sell. However, it is right now my daily driver so I have to get the engine changed first. I will keep you posted.