FYI - 340 is a small block, 383 is a big block - anything is possible if you have the want and desire - and the $$$. I agree with the others here, verify that it IS a 340 and get it! All those rusty parts will need to be replaced anyway, so they aren't a concern.. it's what is behind and under it that you want. Through all that rust and crust - I bet there is a decent 340 in there. That gold car looks (from the one pic) like it has potential.. can you get more pics?