I see that the M1 4-bbl carb intake manifolds modified for EFI are going for some very high prices now. If a person can source their own intake manifold, HiPoTek can machine the injector bungs, two fuel rail posts, and the IAT (intake air temp) port into the plenum. Indy Cylinder Heads http://www.indyheads.com/overstock.htmlmay still have some of these intakes available. The machined injector bung will have a proper radius to prevent shearing the injector o-rings upon installation where some others I have seen are machined with little or no radius. You can also use the following 4-bbl to 2-bbl adapter http://stores.hi-potek.com/throttle-...take-manifold/ with it. While the adapter can be modified for use with the stock fuel rails, the HiPoTek 8AN billet fuel rails http://stores.hi-potek.com/8an-fuel-rails/ mount to the bottom of the intake manifold for a cleaner look.
If you are interested please contact HiPoTek at Richard@hi-potek.com