I have been a quilter for about 25 years. I am new to the knitting thing. As for the antique quilt blocks. You could have them pieced together and it will still have value for being antique, as long as you don't add any different fabric to it. The quilt is only as old as the newest piece of fabric in it. As for washing any of it. I wouldn't do that. Definitely do NOT have it dry cleaned. the chemicals are too harsh and could cause damage.
I think maybe the sentimental value may be more than the dollar value. You may want to contact your local quilting guild and they can recommend an appraiser to give you an idea of the worth.