Lack Of Power

i can turn this engine over by hand with all the plugs in it

You shouldn't be able to do that.

It may just be worn out...

Have you run a compression check on it?

That will tell you a lot.

If your ignition timing is correct, and you haven't advanced it, it's probably not a jumped tooth on the timing sprocket.

I'd start looking around for a 225... and a turbo... :cheers: