Viking,
You maybe confusing peak max power with actual functional, I guess you could call it, power. Where is peak HP created? AT WOT at peak RPMS. Now how often when you tow are you going to be driving down the road with your foot all the way to the floor and turning 3100 RPMS mile after mile? Basically never unless you are Charles and look what he has done to how many BTS trans, rear ends, and what ever else has melted or exploded from applying that kind of power thru these drive trains. Some I think would be surprised at how little TQ and HP you are using even towing up steep grades many times.
But really this is not much of an issue as you can hit the power goals you are after with those PMR and they will likely live just fine. Tuning has come a long ways; there are PMRS living @ over 500 hp. IN fact there is one right now running a 4202 with 200% injectors that's likely in the mid 500s and being constantly beat on.
That H2e can still be used with your plan. That with some 238/80 injectors with PMR adjusted tuning would IMO make a very nice tow/street perf setup. Keep TQ limited to 900 peak will still give you 400-425 HP. You should get good mpg and general manners. Then you can work on getting a forged block in line if you want to jack up the durability and reliability.
In 2000 yr production 15,000 engines were produced with PMR connecting rods as part of the production/consumer field testing of those rods. Many people have found PMRs in 2000 yr engines as confirmation of this. Usually ones from production in the middle months of 2000. Early and late 2000 thru very early 2001 production year engines have forged except for a few exceptions either way in the later. Then it switched back exclusively to PMRs with only super rare exceptions thru the end of 7.3 production in 2003.
