From my experience, unless you buy something that has absolutely everything that you want and more... Plan a few $$$$ for next year up-grades (SSI, Dansk Sport 2/2, 17" Euromeister, CE Wires, AT Intake... Going PMO EFI + TECgt soon to name a few...
As per
aigel recomendation, here is your cheapest upgrade
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Who Will Live... Will See
83 911 Production Cab #10, Slightly Modified: Unslanted, 3.2, PMO EFI, TECgt, CE 911 CAM Sync / Pulley / Wires, SSI, Dansk Sport 2/2, 17" Euromeister, CKO GT3 Seats,
Going SOK Super Charger