I would think pulling from the valve cover is the best. That is what I have done with three engines and has worked problem free. I would say the highest point to try stay away from the oil also. And to come out at the front of the valve cover as during acceleration the oil migrates to the back of the valve cover. I did valve cover on our IA2 with great success.
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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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