I'm putting in a SBC 350 into my '55. Its mated to a T90 and dana18 with e-brake and stock driveshaft. My question is how much clearance do I need between the front of the engine (without any accessories on) and the grill if I do an electric fan and shorty water pump? Planning on cutting the radiator shroud out of the grill to maximize space. If I did that, I'm sitting at about 7.5" of space which keeps me from cutting the firewall any. Too close or will it all fit?