Not a very good angle to see things, but in this pic my drives are pretty much tucked all the way in. Not very much negative angle.

Thanks Mild , I have already starting cutting. The cigarettes all seem to benefit from the notch , that's why's they put them in all the top guns. Gay Kowolski had a cool red and white flat deck that had 5'and a notch in it . Besides it is much cheaper for me a DIYer to glass in a notch than spend the 8 to 10 k it would cost to buy instal and rig boxes. Between the cost of the boxes ( $ 5,000) ,transom work ,steering ram relocation
( extension brackets) drive line Transmissions etc. I can get the same benefit with a fraction of the cost. My 5's have 3 inches of spacers and I am going to start with them 4 inches below the deck and will have the ability to go up to 1 inch below the deck. I am also looking to upgrade to the long tab to assist planing.
Rick G.

I have a question for the other Flat Deck owners. Before I start glassing in my notch I am trying to confirm that these boats were built using polyester resin . Given the vintage by best research so far seems to confirm this but given my hull is a Kevlar hull and polyester and Kevlar are not the best together is it possible that cigarette laid these up with some thing other than polyester resin. I sent an email to CRT hopefully they will shead some light , but in the mean time if any on the board has specific knowledge that would be helpful please let me knpw.
Thanks Rick G.