Many here use the BOP one-piece oil pan gasket. https://butlerperformance.com/i-2445...86vq5_sFEV97Lt
I will say, the method of installation is just as if not more important than the gasket used. A regular Felpro set will work great. One area that requires extra work is the rear main cap. Using a thick strip of cork, glued to the cap will work well.
Make sure the pan’s bolt holes are flat - overtightening a squishy gasket leads to distortion of the pan rail and then it won’t seal right.
Do a search here on that topic as it’s been beaten to death.
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Will Rivera
'69 Firebird, 400/461, 290 Eddy D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears
'69 LeMans Vert, XS 350, #47 heads, TH400, 10 Bolt 3.23 gears, work in progress
‘66 Lemans, 455, 310 KRE D-Ports, HR 236/245, TH400, GV OD, 12 bolt 3.73 gears - see it here:
https://youtu.be/RP_s1wJKm_Y?si=K0NZxoTyaGcj8Dcb
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