From what I have read its only really version 1 which has any chance of being a budget conversion. Once you get into boring out blocks then things are super expensive.
You would need 3.0 heads if you were using 3.0 liners & pistons in a 3.0 block with a 2.5 crank. If you used 2.5 heads the dish wouldn't match the liners, I can't see how that would work. Obviously the new TDC would be lower than the top of the liner but so it wouldn't hit, but you'd still have that sharp angle of where the dish meets the flat of the head poking into the path of the piston.
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