I have the Summit 2801 in a similar driver 400. 0.030 decked, 89cc 6X-4 with larger valve, it has a slight lope at a 750-900 idle, less if you do have a little higher stall. The stock TH350 lockup convertor was terrible and way too tight for a good idle or getting off the line. The cam has reasonable power for a daily driver 400 low compression.
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