454C10 - The posi unit I have - I believe is geared more towards 3.40-3.55 range. This is the unit I am going to rebuild and remove the current 3.08. I am not at home right now and don't remember the exact ratio - but do know it's not the same as what is in the the truck currently.
As for tires - 275/60/15's are on it right now.
The cam(268H) is bought/paid for alread and with posi unit and the low stall converter - from your opinion, sounds like it should work fine.
I am taking all of the opinions expressed above into consideration. I have already replaced the pistons and headgaskets as I agree with techinspector1's breakdown of things.
Sound like I am still on the right track for a succesful combo?