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Can you get back to me with the VIN number and I can verify the engine size. It does sound like someone has been messing with this that perhaps didn't know a whole lot. You might want to go back to what was stock here as it will run well with that equipment. Get back to me with this and I can give you more here.
The VIN number has 17 digits.............
They must have left part of it out............let me see if that is enough.
I can't get it from that...........I will need the block number to I.D. the engine. Let's get that first and then we can discuss more specifics.
The information I show on this says it came with a 360 engine. Let me check some other sources and get back to you.
Usually towards the rear embossed into the casting.
On this one, it should be on the left hand side of the engine diwn by the soft plugs under the exhaust manifold. It may have been a 400 and we can tell once y0u have that.
Let me check that and see what comes up.........
I am attaching a link to the casting number guide for you. See the last few on the list. Perhaps yours is a(###) ###-####and that would indicate it is a 400 engine. Hope that helps here! http://www.rosevillemoparts.com/reference_castingnumbers1.php