This is a big BIG job.... and unless you have a set of very small chambered heads ... this motor is going to be feeble for any type of performance application.

As was suggested above .... using the standard heads ? ... the exh mans will not work in your chassis.

Now I am NOT a 413 motorhome "hater" at all.... my avatar pic of that motorhome is 413 powered. I am in fact a big fan of the 413 ...and plan some major UPgrades for the motorhome engine and usage in a HP applications with some way diff pistons.

Does your Fury have a 727 trans ? .. you can transfer the tailshaft on the Fury trans onto the Winnie trans. But THIS is also a big job.