My advise is to look at the CMP website and see what they list as conditions for their different grades with prices they charge now, and see how yours compares. But right now, they have no Winchesters for sale. There is a premium for Winchester receivers/parts, just because of the name.
http://thecmp.org/cmp_sales/rifle_sales/m1-garand/FYI
No Garands have "matching" serial numbers. The only serial number is on the receiver, the numbers/marks on all other parts are part numbers, heat lot codes, inspector marks, etc., all of which are used to help determine the "correctness" of the parts compared to the receiver. The vast majority of Garands are "mixmasters", that is a mixture of parts from other manufacturers, early or late part versions, etc.
The first thing to confirm, is that the receiver is not a previously de-milled receiver that has been welded back together, which would have the two now joined halves from two different original receivers. The second thing to confirm, is that the receiver is not welded to the barrel (former drill or honor guard rifle). Would need to look under the rear handguard.
If the receiver is an intact original, then without knowing what all the parts are, the value can only be a wide ranging guess. CMP (Civilian Marksmanship Program) sells surplus Garands for $650 (field grade) to whatever a collector grade (with all original parts as it was issued by the manufacturer) will bring on their auction site. This could be multiple thousands of $$$, even if in poorish condition (as long as ORIGINAL). Some Winchester parts (if in spec) can be worth hundreds of $$ by themselves. Retail values vary widely across the country as well.
If I have to offer a "Ball Park" value, I would say $650-$1000, give or take a few hundred $$.