oringinally i was toying with the idea of a 4bt, but then changed my mind to put a 4-53 in my 3800, and ended up moving the firewall in about 4." I then had to shift the pedals away from the middle of the firewall (gas pedal was the hardest to figure out to make it comforatably driveable). Im not sure if the 4400 engine bay is longer, but I found out i could have saved a couple inches using an electric fan, and possibly mount the radiator in front of the support.
