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for 800.00 it was a deal, the heads are completely rebuilt 906, it is a 69 block with 906 heads, that is why i bought it, for the money i cannot go wrong

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Wasn't that good of a deal if you have to replace the pistons ... ...

That said here is the rub , WHAT DO THE PISTONS in the engine weight NOW ??? You have an external balance engine , balance is critical .

Here is your main problem the true 10.0 piston, the piston that came in the 68-69 440's IS NOT REPRODUCED , you have 906's so that is the only piston that will get you close to the OVERSTATED 10.0 from the factory. The 2355 is the 70-71 6pk piston and in 70 at least the engine had a HIGHER than 10.0 rating from the factory , that replacement piston I am told is 40 grams heavier than the piston it replaces.

Good Luck in your quest to fix your good deal ...