First, if it seated evenly to the block and you hand tightened the bolts, you're good to go as TOH said.
Secondly, " Replaced points, condenser, rotor, cap" is not " rebuilding the distributor". That's called routine maintenance. (see tip # 40)
Did you set the timing? That's also needed once you replace the points.
The first thing you need to check is bushing wear. If the shaft has any sideways movement AT ALL, the bushings must be replaced. (see Note 2, below) Next, if this is the first time you have had the distributor off the tractor, make sure the advance weights are in working order. (See Note 1, below).
If the insulator and copper strip tested ok, best to leave them alone. But, if they need replacing, it's a common repair. The insulator is under the brass concave head screw & where the copper strip attaches. (it's fiber & will wear out; poke & prod w/ your meter leads to make sure it still works) If you need to replace the insulator, use a .250 x 3/8 nylon square nylon anchor nut available at most big box home stores. Look very carefully for cracks & breaks on the copper strip.
Note 1: Unscrew the plate hold down screw & remove the C clip to get the plate out. Remove the shaft & weights. The weights should freely move.
Note 2: There are three ways to replace the bushings in a front distributor:
1. Buy new bushings (part numbers 9N12120 front & 18-12132 rear). Press out the old ones, press in the new ones and ream to fit. CAUTION: do not try this unless you have a press & know how to use it. If you break the base, a new one costs $130. If you bend the tower which holds the front bushing, a new plate will cost you $30.
2. Take the new bushings and distributor to your local machine shop.
3. Send the distributor out for bushing replacement if you do not have a
local machine shop.
Make sure your distributor isnít worn out; check the wear parts with a micrometer and compare what you have to the factory specs (below).
Shaft top .4367 / .4370
Shaft Bottom .8625 / .8630
Cam Flats .789 / .791
Cam Lobes .869 / .871
Base Tang .177 / .178