You would have to have a coupler made to connect one crankshaft to the other. Then you would have to find out at what degrees the crankshafts should be for a smooth operation. Of course, they would still have separate ignition and fuel systems.
You would also have to make sure that engine #2 (whose crank shaft connects to the transmission but sits behind engine #1) is able to handle the torque output of both engines combined.
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This is close to the Firing Order of most GM and Chrysler small block V8 engines which is 1-8-4-3-6-5-7-2. However, I know of no V8 engine using this firing order. So, what it is I cannot say, except it appears to be the firing order for a V8.
In a 2004 GMC Envoy both the 4.2 liter six cylinder and the 5.3 liter V8 engines use a timing CHAIN
if you start engine and look under hood you will see what direction the engine runs by looking at the fan and pulley wheels
The Fram website allows you to look up this filter as a "Competitor Cross Reference" The K-Mart K-5 oil filter cross references with the Fram PH25 and appears to fit a wide variety of engines, especially General Motors V8 engines from the 1970's.
A v8 can last longer than a v6, and a v6 can last longer than a v8. This all depends on how well each vehicle is maintained.