Yes, definitely do torque the head bolts to spec. Spec is in the range of 30-35 ft-lbs, 30 will do just fine. Be sure to look at the tractor service manual and find the head bolt torque sequence, and follow it!
Before you put it all back together, I have a recommendation. Because you blew the gasket, you may have warped the head or it was already warped and caused the gasket to blow. The way to remedy this is to take a piece of 220 grit sandpaper, and set it on a flat glass plate, then sand the surface of the head down until it is flat, making sure to keep a random sanding pattern so it works evenly. With the head on a flat surface, you should not be able to stick a .003" feeler gauge under the head in any area.
Once back together, run the engine for a couple hours and then re-torque the bolts to 30 ft-lbs again. When you replace the head gasket, it compresses and the head bolts will loosen slightly. Re-torquing them will remedy this.
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'70 107 with k301 engine swap
'71 106 with 38" deck
'70 147 R with factory replacement k321, 42" deck
'61 Original with 38" timed deck
'63 70 "pinkie"
1863 with 54" deck
'46 Farmall H, '50 Farmall Cub
105 x2 (parts)
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