While you have the intake off set the manifold down on the heads without the gasket and check the fit with a flashlight and or feeler gauges. There are some folks out there that still machine intakes to compensate for milled heads and that intake will ONLY fit the engine it was machined for.Unless that TM7 was fairly new I suspect that may be your problem Just something I have seen before
Gus

7518001-savoyburnout.jpg (30 downloads)

64 Plymouth Savoy
493 Indy EZ's by Nick at Compu-Flow
5-Speed Richmond faceplate Liberty box
Dana 60