just wondering, mind you, just wondering about installing my H& M '67 side oiler 427 in my SPF GT40 Mk2 replacing the Roush 427. talked to Lee Holman once about doing this. he said had to modify firewall for FE water pump, use different rear uprights (did'nt say why and i did'nt ask). said exhaust would cost $2000.00. no problem there, have friend with patterns for exhaust bundlel of snakes. any ideas about why new rear uprights? not interested in selling but thinking of novelty and prestige of real 427 in GT40 Mk2. 427 currently residing in '73 Mercury Montego GT. also interested in electric water pump.