Looks like you are thinking of upgrading!
The differences between what you have now, 79 29 footer, and a 95 34 footer are HUGE.
The Truck you referenced above is likely at it's MAX with the 29 footer you have. The 34 would put you in dangerous territory regarding GCVWR.
In other threads you mention looking for a 22-25 footer in a late 90's vintage. That is a more realistic match to the truck than a 34.
79 Ambassador 29 factory weight =4690
95 Excella 34 factory weight =7100
That is a 2500 LB difference without ANY stuff. Unless you plan to upgrade to a 3/4 or 1 ton I would pass.
JMHO, but you asked