AMC 4 barrel to TBI plate?

[yossarian19]

I have a 401 that is going to get 454 TBI slapped on it. Right now I'm on a four barrel intake with a Holley spread bore TBI adapter. If you are up on carbs, you already see the problem: the 4350 spread bore that AMC used is *not* the same spread bore that the Holley adapter was made for.
So, what's the solution here?
It looks like a die grinder might fix my problem.
Would a 2-barrel AMC intake work?
Edelbrock Performer intake?
Some other adapter that is designed for the AMC intake?
I got the Holley adapter free (birthday present) not realizing that "spread bore" wasn't sufficiently detailed. I don't want to spend $300 making a $60 part work, though.

[TexasJ10]

Hamilton has good options for tbi adapters

http://hamiltonfuelinjection.com/category/5-throttle-body-adapters.aspx

[babywag]

Get a hold of a square bore intake, I don't believe anyone makes an adapter for the amc motorcraft 4350 4bbl intake.
Plenty of used intakes out there if you don't want to pay for new.

[yossarian19]

Hah! It looked like there was no way it would fit, with 1/4" or so of intake manifold showing under the adapter plate.
The 454 TBI unit can open all the way with no interference, though, so it'll run.
I'm going to use a die grinder to smooth the transition from adapter to intake manifold to minimize the harm there and eventually I'm going to buy an aluminum intake manifold - but it'd work with *zero* mods.

[Blinkinlights]

Transdapt 2199 will go from AMC/Ford spreadbore to Holley square bore.

[Woodchomper]

Whatever adapter you end up using make sure the TBI unit fits properly. The newer 454 TBI have a larger base. Check out the pictures in the link below:

https://www.thirdgen.org/forums/tbi/456976-who-atually-using-gm.html

[Bill USN-1]

http://www.binderplanet.com/forums/index.php?threads/454-tbi-adapter-cautions.105992/

[Mr. Wilson]

I got mine from Bill at binder planet. I put it directly onto the spread bore intake in the 76 and put the TBI straight onto the adapter. I drove it to and from work today, about 75 miles. It works great and if you tell him spread bore he'll send the correct gasket. I would call Bill at binder planet, his adapter is top notch. Heck it looks like it's aircraft grade.