Converting '95 TBI 350 to 350 Vortec engine. Have 4 barrel manifold and adapter to 454 TBI. Purchased 454 TBI and cleaning it up. Will follow suggestions from posting "Need help getting started vortec tbi. The ECU is 16197427 with BJYM mask tuned for 350 TBI. Conversion to have 454 TBI. Don't have specs on fuel pressure from pump in tank. Will need to retune ECU for Vortec and 454 TBI. Vortec out of vehicle now being built up, has earlier timing cover and 6.25 damper installed. Any comments/suggestions about this conversion would be welcome.