You should have no problem with that firewall as it appears to already be about 4". My engine in my 'A' was a problem but that was due to a couple of situations - the TCI chassis already had the motor mounts welded in - an inch too far back, then my Brookville body came with the 3" recessed firewall rather then the 5" that I ordered. I have plenty of radiator to fan clearance even with a long water pump. With a short pump, the motor mounts in the correct location I could probably have not had any firewall problem.







I could have (and might yet!!) run a conventional fan just to clean things up