I'd second that. You'll be money and time ahead to use as many of the Holley components as you can.
The pan, the engine mounts, headers, and exhaust all work together. They have a crossmember for the T56, but I'm not sure how (or if) that would work with the TR6060. When you use the mounts and crossmember together, it also takes care of the driveline angle (though you may have to shim the rear). With the 6060, you may need a CV shaft, which will negate driveline angle issues all together.
Obviously you can mix and match all those parts from different vendors, but then you'll have to work out any issues that you run into.
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If you are using the Holley kit and stock subframe the Mast Motorsports pan fits perfectly. I bought mine before the 302-3 was released. Hooker LS headers are also perfect.
Jayson
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1969 Camaro
Kore3 Z06 brakes
Hydratech hydroboost
Wilwood master
Ridetech stage 2 with truturn
Forgeline GA3 18x9.5/18x12.0
BFGoodrich Rivals 275/35 & 335/30
Magnum T56
Lots of AMD sheet metal
Sprinkled with DSE parts
Ididit Steering column
GM 376/525hp crate
Moser 12 bolt, tru-trac, 3.73:1
Speedhut Guages
Vintage Air
Corbeau LG1’s
Digi-tails
Ringbrothers
Harwood cowl
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