It's to late to tell now but when you change out the starter and flywheel and install new ones. When you bolt them on pull the starter gear into the flywheel with a screw driver. When the teeth are engaged you should have a gap on the engaged teeth that you can fit tightly a 1/8 inch rod into. If it's too tight to do this you need to shim the starter down until it fit's snug, that will give you the proper engagment, it it's a GM type starter, Fords are different.
JMO
Zip.