Tbi swap build thread

[raws67]

As others have already said thanks what a great thread for the TBI swap! I am still gathering info and in the planning stages for my TBI upgrade. I am at a point right now where I need a little guidance on the Drac issue. What I have and plan to install with the TBI is a 90 corvette 700r4 (will manufacture rear mount for vette tailhousing) with the 4 pulse vss and I also have a 90 suburban speedometer I want to use. I need to know if a DRAC will even work if I am going to use a 7747 ECM or do I need a 90+ TPI ECM? Or any other suggestions?
truck is a 78 SWB BIG10 3.42 rear
350 goodwrench w vortec heads, weind street warrior intake,
Crane cam 100052 (cam specs)
Intake Duration at 050 inch Lift:216
Exhaust Duration at 050 inch Lift:216
Duration at 050 inch Lift:216 int./216 exh.
Advertised Intake Duration:272
Advertised Exhaust Duration:272
Advertised Duration:272 int./272 exh.
Intake Valve Lift with Factory Rocker Arm Ratio:0.454 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio:0.454 in.
Valve Lift with Factory Rocker Arm Ratio:0.454 int./0.454 exh.
Lobe Separation (degrees):110
1.6 roller tip rockers
2 1/4 true duals with super 44's (plan is for ceramic chevelle headers when I do the upgrade and weld 3 wire 02 right after collector flange)
Has no emission requirements so EGR I am not worried about but will most likely install purge tank from donor. Also do you feel that an alt upgrade would be needed from the stock one considering the extra juice needed?
Right now I am stuck in the planning stages and need to know if the 4 pulse vss is going to work or an idea on what would be the best route with what I have. Thanks