Probably the T400 or T300 with a shaft with a low flex point, ideally fitted to your swing by an authorized Titleist fitter. ProV1x will help too.

As well, don’t pay attention to the number on the bottom as to the loft. I hit the T400 7 iron better (higher/longer) than a T300 5 iron. They are the same loft. I have 6-“43” then 48/54/58 wedges. I have moved to a 23 hybrid over the 6 iron to get enough gap from the 7 iron. The 43 degree T400 is a common PW loft (43-44 degrees)

I’ve had every release of AP1 or AP3 since 712. I’m not planning to upgrade these T400’s. Age 71.

JDuda, a little bit older (will turn 75 in September) than you are and as I usually do when I go for new clubs, I go see my Titleist certified fitter. I was playing the 718AP1s and moved to the T300s in 2019. The fitting went well. Took my previous set with me as I always do to the fitting so we can do a fair comparison, and I can warm up prior to the fitting. We tried all the new heads and various shafts. We finally settled on T300s, with the AMT Red Regular shafts. I was previously playing stiff shafts. At the fitting I was hitting the 7 iron (Prov1) on a straight line high over the flag around 165 yards. I love my set but did not get to play many rounds with them due to back surgery in Feb 2020. Drs released me to return in mid December 2020 and am now striking the clubs with some authority. Do not have to work as hard to strike the clubs and the results are good. Coming back has not been easy and the game has been rather bipolar, but am very pleased with the clubs. I made the right choice, getting a good fit is a must. You have to get the set that fits "your game", because we all are different......

The stock shaft in the T300 and T400 is the AMT Red, which is a higher
Launching shaft designed for those irons. The AMT concept is pretty neat, with the shafts being lighter in the longer clubs and vice versa for the shorter clubs. The lighter shafts give you help on the longer clubs. The Elevate shafts, also by Dynamic Gold may be worth trying.

A Titleist fitter is the way to go to make sure you have the right set up. I would recommend getting fit outdoors.