I have a 65 442 with the Jet-a-Way 2 speed automatic transmission and am considering replacing it with a 2004R. Is the Jet-a-Way case the same size as the Power Glide?. The 2004R is only 1/8 longer than the Power Glide but I do not know if there are differences between the BOP tranny and the Chevy tranny. Thanks for any input.