What Swifter Said. To really evaluate the deal we need some numbers.
Prices for USED 6.1L Hemi range between $4,000.00 and $6,000.00 depending upon condition and or mileage. There's a few on ebay right now for around $5,500.00 which in my opinion is a bit high.
The list price for the FAST setup is $3182.35
Brand New 6.1 from Summit $6832.99
FAST transplant kit for $3182.35
TOTAL $10,015.34
My view on pricing:
If the motor is used with a price of LESS than $5,500.00 for both components would be a smokin' deal
If the motor is a new crate motor LESS than 7K would be a smokin deal for both components
This is my view of "smokin deal" your idea might be a little higher or lower
All that being said a couple of warnings so you know what your getting into:
At a minimum you'll need the following parts to complete the swap:
New Oil Pan and Pickup tube
New fuel system including fuel pump and Pressure regulator
Motor mounts
Headers, with an Alter-K-tion you can use Jeep Manifolds, otherwise you're buy TTI, 5.7 Jeep manifolds will work with the factory K-Member, but would be overly restrictive on a 6.1
Radiator, either modified factory or new one, inlet and outlet are in different locations
Oil Filter Relocation Kit (unless, you are using an RMS Alter-K-Tion, I think??)
I didn't price any of the above out because prices vary widely. For example the cheapest pan and pickup is the one from Milodon, but it won't work if you are using a the RMS Alter-K-Tion. Fuel systems can be put together for as little as a few hundred dollars, others buy custom stainless tanks with intank fuel pumps for over $1000.00
Finally, a word about FAST and plug and play, FAST does come with a couple of "tunes" which will get the motor running, and this is VERY helpful but it isn't a perfect tune. Finding someone with FAST experience and a chassis dyno would be money well spent.
With all that in mind, I am a very big proponent of the modern hemi swap, but want people to enter it with their eyes open.
Best of Luck,
Regards,
Joe Dokes