I just did this switch. You will need Pontiac motor mounts and mount brackets(any 67-69 F-bird motor mount brackets will work), a TH400 crossmember (found on e-bay for about $50), TH400 driveshaft slip yoke, and have the driveshaft shortened about 1/2-3/4 if an inch.
69 Firebird, FINALLY installed the Pontiac 469.
01 Red and pewter GMC Ext Cab SIERRA SLT 4x4
02 Maple Red (maroon) LS1 Trans Am
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69 Firebird, .060 over 455, UD solid roller 254/262 @ .050, Scorpion rockers, home ported 6X-4 heads, Holley 850 DP (bone stock), Holley SD intake, with Summit 3 inch x-pipe and goerlich Xlerator mufflers. 12.27 @ 115mph.
02 Midnight Blue LS1 Ram Air Trans Am WS6 (440 rwhp)
http://firstgenfirebird.org/show/closeup.mv?CarID=642
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