neither,ihave a 350/350 combo in my 49 with no problems no mods to firewall or floor. check the motor mount and trans mount kits from chassis engineeering in iowa . both should run you about $160.00 they are bolt in with good measurements and clear instructions.......dave


1949 Chevrolet 3100

"When this thing hits 88 miles an hour, you're going to see some serious sh%t." -Doc Brown