If you remove material off the runners, the intake will sit a bit lower. You still should be ok as there's space from the valley pan.
Well, you know the gasket are .060 thick. You could try installing the intake with only one gasket see where your at. I guess if you take too much off they make thicker gaskets. Tin Indian I think has them. Those are really good pics you posted.
My intake I cut at the bottom like yours to accommodate the valley pan. If you take .030 a side off that's like one whole gasket. I wouldn't do .050 a side. That's seems like alot. Another thing I did was use the feeler gauge between the heads and intake as I would snug the bolts up a bit to see if there was contact. Tedious process but tells you what's happening.
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68 Firebird. IA2 block, 505 cu in, E-head, Solid roller 3650 weight. Reid TH400 4:11 gear. 29" slick.
Best so far 10.12@133 mph. 1.43 60 ft.
76 Trans am, TKX .81 o/d, 3.73 Moser rearend,
468 with KRE D-ports, Doug headers, 3" Exh.
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