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If it will even run at all, it will run badly. Going from a 305 to a 383 is a MAJOR jump and as it is, the stock programming wasn't even optimal for the 305.

Long story short, you're going to an need extensive custom tune to even make the 383 run correctly much less run good.


Edit: You're also going to need bigger injectors and a bigger TB. The stock unit will (most likely) not flow nearly enough CFM's for that 383.
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1997 Mystic Teal Trans Am, M6, Leather, Hardtop.
TB Bypass, CAI, Pacesetter LT's, Flowmaster 80 Series
!CATS, !AIR/E.G.R., !CAGS, And a PCM tune done by Thunder Racing.

[ Edited on 05/24/2007 @ 00:33:27 ]

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Posted By: roubenbird On: 05-24-2007 @ 23:11:17     Reply | Top | Edit

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go carbed or go home, and im a fan of TBI!

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WS6 3o5 TBI 88' Formula, 670cfm Holley Projection Throttle Body Holley Projection Intake Mainfold, Underdrive Pulley,Dual Snorkle & Factory Cowl Induction,now with short straight pipes, UMI Subframe connectors, Fourth Gen seats, Three row Radiator, Posi rear end (2.73),TPI heads, 1.6 roller rockers
15.543 @ 88.21mph

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Posted By: wiz8891 On: 05-25-2007 @ 00:51:42     Reply | Top | Edit

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It's actually a 350 not a 305, i was told it came out of an 88 chevy pickup
[ Edited on 05/25/2007 @ 00:53:18 ]

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Posted By: 2piececrank On: 05-28-2007 @ 01:38:02     Reply | Top | Edit

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The TBI units on chevy pickups actually have a decent amount of flow to them, and should be able to support your 383. TBI units from 350's flow ~600cfm and the 454's flows 670cfm. There are also aftermarket units as well that flow 670cfm and up, but you will pay a fair deal for it.
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1989 Silverado 4x4, 355ci, RV cam, 160 thermostat, Vortec Heads, Stainless Exhaust, Hypertech Chip
1980 Camaro, 350 with a snapped crank (hence the name) (New Engine going in, delayed, TBA)
http://www.cardomain.com/id/2piececrank

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