Correct exhaust manifold

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Those are the stock 340 manifolds for the '68-70 models. It will fit the car and 340/360 heads. The LH manifold won't have any heat stove attachment points like the later cars have. Other than that, they will fit fine. Stock outlet.....whatever that measures.....they're all the same.
 
Yes, those manifolds are worth quite a bit nowadays, seen them from $550-850 a pair in the last swap meet last weekend. Overkill for a 318 with stock heads, work well with 340/360 heads...
 
On the ones I have, (same casting numbers) the outlets measure 2 1/4".
 
A set of TTI headers might be a bit cheaper, and deliver even more performance. Not a plug for TTI, just thinking about your wallet.
 
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