What you are showing as a "dash" is actually an instrument cluster. The one you have is the stock low line cluster, the Swinger 340 would have a completely different dashboard shell and a ralley instrument cluster. You have to do a lot of changes to make it work. Pull the windshield, unbolt the dash and disconnect the heater controls, defroster hoses, and all the wiring including the bulkhead through the firewall and the connector going to the trunk wiring. Of course spending over $1000 on the complete dash assembly, which is 1970 Swinger 340 specific is just the beginning...