A 7 passenger built on an E150 chassis can not be safely converted, but a 7 passenger built on an e350 can. The e150 does not have enough spring rating and if it is an e150 that was built before 2007 the brake system is to small as well.
Behind the passenger kick panel
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The companies that offer van conversion kits are: Convert Your Van LTD, CamperVanLife, NorthWestCamperVanConversions, Pathfinder-Vans, and Hoosiervan.
Pour
try looking on the passenger side side panel under the dashboard should be a little black button?
6x8
5 qts
Top of the engine, on the passenger side.
Depending on the model of your camper van, it may be slightly difficult to convert properly. You should have a look at a YouTube video prior to attempting the conversion of your camper van.
In the gas tank!