Wood prop

Thank you Larry, very helpful. So if I understand you correctly 75 to 85 is essentially a carb change so weight change N/A but more power and a requirement to change the prop ($3,500 - $5,500) - ish and while wood lightens the overall empty weight it also changes the weight and balance a good bit. What I'd like to do is to lighten as much as possible in order to improve glide rate if at all possible without messing with the W&B. I probably am spoiled by the 150's 70mph glide when doing "power out" and with Tweety it is more like 80 mph to maintain the same 700 fpm descent.

Upgrading a C75 to a C85 requires different carb jets and a new prop. You’ll have to go to a shorter prop. I have a 71-49 on my C85 and it cruises at 110 and climbs great. But I have the O200 crank STC. It’s pretty easy to make a 75 an 85 but the prop change is expensive nowadays.
I’m not too crazy about wood props. You’re losing weight but it’s really far forward of the datum.
But to each his own.

Marvel Shebler carb? My 150 had that, I am still working on learning all the nooks and crannies on Tweety.

After I get done with this $10,000.00 annual I am currently in and rebuild my bank account then possibly. What is the cost on doing that? My goal is to lighten the aircraft as much as possible first, does bumping up to an 85 add weight? If so how much vs any gains?

Right now Tweety comes in a lot hotter on landing than my old 150 does and I can't do the "impossible turn" that I could in the 150. Basically Tweety's a bit of a hot rod. I do love the 900 fpm climb on a hot day with Density Altitude of 2506 tho.

The costly thing in upping HP is the Carb work.

Mac, the first thing to do is to up your HP to 85. Then go to a 51 pitch you are not high ASL to need a climb prop. Wish you were closer I would let you use one to try out with your 75.