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The Mopar electronics distributor is a real nice unit, but the rest of the system is problematic for many users. I would replace both the ballast resistor and control box with GM's HEI D1906 or equiv module. Super simple hookup, two wires from the distributor connect at one end, two wires to the...

The early 273 used a smaller head bolt and, this is the problem "a different bolt angle." You can open the manifold mounting holes to allow for the angle but the bolt head does not fit flush. I use 66 and later heads drilled and tapped to accept the normal 3/8 manifold bolts. Now that I think...

My understanding is the Windsor Poly which was unique to the Chrysler line would accept the hemi head, whereas the Plymouth Poly would not. Regardless the Poly engines which were dubbed "semi hemi" will, with proper porting put out HP numbers comparable to the hemi.