Need help with my TRX 300 Fourtrax

[ton_e_montana]

Its a 1994 2wd model utility.  Previous owner boogered the drain plug.  I went to change the oil and had problems.  In the process of re-tapping it the case cracked and I lost a piece around the plug.  I have a spare motor.  Anyone out there good with rebuilding these, especially lower end of the motor?  I will probably freshen the top end when doing this but I need someone who I can trust to help me with it.  I am near Gainesville but willing to drive for the right help.  Thanks.