The thermostat just sits there in the housing. The housing should be bolted down with two 3/8-16 bolts that are tightened to 45 ft/lbs.
What is the torque specs on a 94 GMA Yukon
boxwrench.com they got alot of torque specs on there
17 ft./lbs
Torque specs for what part of the engine? standard answer: keep turning until it gets easy...
65 ftlbs
Head bolts are 65 lb/ft. Look at the link, "Small Block Chevy" at the right for all torque specs.
70 ft lbs
You can find them here->http://www.boxwrench.net/specs/chevy_sb.htm
17 ft/lbs.
Go with the 350. depends on your budget, 305 should go pretty good
75 lbs--rods 45 lbs
Pistons don't have bots. More information is needed.