Thinking of going BB...

346 and 452 are essentially the same head except for the seat hardening. 906 is NOT the same as 346/452. A side by side comparison of the intake ports would show you they are not the same. Don't flow the same either. Stock 906 will outperform stock 452. Both heads mildly ported, the 452 will often flow better at higher lifts than the 906, but the 906 usually flows better in the .300-.400 lift range. Take you pick. My opinion on wrist pins: If you are on a budget, just use the stock rod with a pressed pin. If you want to use a piston with a floating pin, don't dick around with the stock rod. By the time you have the rods magged, resized , shotpeened and bushed, for jut a little more money you could have had a BRAND NEW set of H beams.