I switched because I am turbo'd now and the downpipe hit both my stock and tog dipstick.

I used the Part Number # 625-TD-34L60EFM through Jegs. As for the mounting I just did what worked for my setup.

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Red 2dr 99 GTP: Z7 t66, A/A IC'd, Custom Heads, 65# Inj, ST2 Cam, Meziere Elec Pump, JP Double Roller(with machined crank gear), Plogs, PLX W/B, Powrtuner

99 Regal GS (work car)