I am new to this site and I was very suprised to see a mustang II forum. Well I have a 78 cobra with a 306 and 12.5 compression a voodoo cam with 268 duration and 522 lift with gt 40 heads edelbrock rpm intake with a 650 double pumper. The trans is a c4 with a 2800 tci stall that goes into a ford 9 inch with 4.11 gears. I have 15x10 centerlines on the rear with a 295 50 15 and 15x8 on front with a 235 65 15. I am going to change my combo its to much for the street and I am putting a 347 with a tremec 3350 has anybody done this? Will the tranny fit in the tunnel?