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Still won't have enough air

8.3 doesn't have enough air to spool an HT4B Maybe a 3b if it's lucky. They are both reverse rotation turbos though

It depends really. You still have to pull the engine on the a1 truck and redo the front mount then swap in a big cam etc. If 923s were still 3 to 5k like they used to be sure it would be cheaper to do it that way. Also depends on how much down time you can have. A2 has ctis which is a good...

Nothing changes you are just making the truck an A1 rather than an A2

You can get a 923a1 firewall housing, cab mounts,engine mounts and jackshaft and install a big cam into it. That's 400hp. Alot of work but you wouldn't crawl up hills.

For increased braking power install a pacbrake exhaust brake on the A2. @profo has a highly modified 927a2, intercooler, bigger turbo, weighs around 34k and it has a time pulling hills out west and the engine is maxed out fuel wise. The 8.3 is not powerful. So you are not going to get up a...