Engine running to cool

[Mertz]

I have a 350 in a 72 Chevy 3/4 ton pickup with 350 pretty much stock except MSD Ready to Run and ceramic headers with performer intake and qjet. I have a 195 degree tstat. When I warm up the truck it will get over half way from center on the stock gauge and then drops to about 1/4. I am assuming that when it is over half it is a about 195 or a little higher. That would mean I am running well under 195 under normal driving conditions. I don't have a temp gauge hooked up yet but it seems reasonable that it is running very cool and is probably hurting my performance and mileage. I don't think a higher temp tstat would make any difference in cruise temp. Timing is at 36 all in at 2800. Is there a good way to make this run a little hotter to help fuel burn, power and mileage. Temp sensor is on the head.