Don't come here asking for opinions and then get pissy when people give you a reply you don't like. That being said, I will make an attempt at answering your question with the little information that you provided.
First of all, it sounds like it's too late but did you really need to take the motor apart to begin with? In most cases a simple 3,000 mile service and a carb rebuild will get these motors back up and running.
Second, your expense is not going to be in the engine, it will be in all of the other things that these bikes need to brought back up to spec. You can spend a fortune on the engine and your bike will still be a rolling pile of #$%* if you don't address the rest of the bike. Almost without fail you will need cables, tires & tubes, steering head and wheel bearings, fork springs and seals, new shocks, and on and on. I'll take a guess that you aren't building up this engine to put in the bike without doing some other upgrades. You'll probably need to get the tank boiled out, the seat cover is most likely shot, and if you plan to paint it then you'll spend a few dollars there. I could go on and on telling you about all the orders you'll be placing on the internet for rubber pieces of all sizes and shapes. We haven't even talked about new bars, new brake shoes, rebuild kits for the caliper and master cylinder.
In other words, your engine is not going to be your big expense and it will be easy and quick compared to the rest of the work you have ahead of you.
