Good idea to change the hoses with the valve. As Jim mentioned, the hose connection under the intake is a real knuckle buster. Took me a while to get the hose to seat properly there. If you pull the manifold back, here's the view:

Certainly not necessary to pull the manifold to do the job, though. Good access to the breather box, if that's on your 'to do' list...
The heater hoses might be stuck to the heater core nipples on the firewall... you might have to cut the hoses to remove them. The nipples are soft and easy to damage, so be careful there. Don't think you need to do anything special with the vac line.
There was a discussion in the 900 forum recently on the pros & cons of OE vs. aftermarket heater hoses... you might want to check that out.
- Brian '93 945T
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