A few things that would "concern" me. The BSFC numbers and the VE both are not what I would consider "ideal". Also she's got plenty of oil pressure for sure! Would like to know what they are measuring with the ManP and ManV are measuring and where that's being done. Jim's speculation seems as good as any but I can see Oklahoma in the summer seeing even a corrected Baro of 30.1, this aint the east coast we are talking about here. 5.5" drop in manifold pressure would be HUGE in terms of carb sizing if it is measure manifold, but I dont see in any pics where that is what it is measuring, but again it appears Jim's speculation is correct in that it is measuring baro but even that woudl have to be corrected and I woudl question the 30.1 number even corrected in Ok in the summer.