OK

can I mount sbc Alternator+PS pump+AC compressor on LT1 brackets ??

 

If you are going to go with enough gear then you certainly can swap cams and keep the f-body motor. The bottomends are the same, the heads while one uses iron and one aluminum flow similarly with the worst of the aluminums coughing up 5% but leaving more room for porting and the best aluminums being equal to the irons in flow, the iron heads have pressed studs so you would want to keep lift below about .525 or face the added cost of machining for the screwins the aluminums come with. The cams as noted the b-body cam makes more torque at a lower rpm but something like the Crane cam noted should have about the same lowend and just have more in the middle and above. There is a thread about "CAM and Granatelli dyno tune" the guy just today put down 318hp334tq with that Crane cam and stock exhaust manifolds, if you ask I am sure he would share a dyno chart which should reiforce how good a cam this is. The only way I would really suggest selling the engine you have and getting a b-body one is if you want to use the b-body cam or can sell the f-body motor for a good bit more than you would pay for the b-body.

 

you could sell the lt1 and build a setup like this
http://chevyhiperformance.com/techarticles/76178/

 

He wants to keep it injected though and by using an LT1 he can use the LT1 fuel injector rails. I wonder though is there a TPI base for Vortec heads, that would be a way to use factory fuel rails and make MASSIVE torque. As noted the biggest pluses to the LT1 are it's injection and heads, he already said he is going Megasquirt and Vortec heads flow about equal to LT1s.

 

You be btter off using a TPI unit in your truck due to the low end torque it produces. And it will be good for for what your doing.