Since the big-block Mopar's oil pump is on the forward, driver side of the block, the engine isolator mount is shaped for clearance. It's also engineered to bolt right to the Slant Six K-member while properly locating the engine. | 
On the right, the mount is offset and bolts directly to the Slant Six K-member. |
While bolting on the driver-side engine mount bracket, we installed the top portion of the torque strap since it utilizes the same mounting provision. | 
The Schumacher headers are a "tri-y" design, meaning the four exhaust ports dump into four individual pipes, which dump into two pipes, which dump to the collector. This design really helps flow and is a big improvement over exhaust manifolds. These headers are quality pieces with thick tubing and flanges. |
The driver side is where things get tight on an A-Body with a big-block, but these headers give plenty of clearance for the starter, changing spark plugs, and the steering column. | 
The instructions warned that certain blocks have an unused boss that might need to be ground for clearance. Ours happened to be one of those blocks, so we marked the area with a Sharpie and used a carbide bit in our pneumatic grinder. |
With all our parts bolted to the engine, we moved on to the K-member modifications. Using the provided template, we scribed a mark on the driver-side mount pad where it will have to be modified to clear the oil pump pressure relief valve. |  |
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Using a drill, we drilled the corners of the marked area so they'll have a smooth radius. This will prevent the part from cracking in the future. |
Using a die-grinder with a cut-off wheel, we made the necessary cuts to the engine mount provision on the K-member. | 
Using a carbide bit, we radiused and cleaned up the edges of our cut, then painted the area to prevent it from corroding. |