Still Having Starter Problems!

I had posted a previous thread about my 1986 Ford F150 starting problems and I have done everything I know to do,I have checked the timing,checked the battery,replaced the starter(the one I put on a few days ago broke,thats the 2 starter to break in a month)I tried a shim on the starter,changed solenoid,put new flywheel on,nothing seems to work!The engine tries to kick backwards when starting thus binding the starter and breaking the mounting brackets.PLEASE HELP!!

what about your plug wires? There is a chance you could have one crossed up and it would run ok. check 7 & 8 also make sure 7 & 8 are not running together because #8 fires 100deg before #7 gets to tdc so when the magnetic field collapses on #8 it fires #7 100deg btdc