Is it going to be like a new bike? No. Just look at the routine maintenance schedule for comparison.
These are still quite reliable bikes that in their day would ride coast to coast to coat with just oil changes and the routine tune up schedule.
Aftermarket parts aren't made to be reliable, just make you happily part with your money. And "cheap" has a dual meaning for cost and quality.
If you are restoring to "good enough for now", then don't be surprise when "for now" is a short term solution.
By the way, if you are customizing and re-engineering bits, don't blame the bike for not working like a stock one. No machine is any better than it's mechanic. And a "custom" machine frequently does need "custom" attention. Hot rods are generally in a constant state of attention, especially newly made ones.
Cheers,