A couple questions about need for high pressure, are you using BG-10's, if so you need high pressure, if BG-14's that is not the way to go. Most folks do not understand that more than 80K btu's under a 16" pot or keg is just not going to work, the multijet burners look impressive but have to be mounted 10-12" below the pot to get enough secondary air to burn right, and most of the heat just blows away. The BG-14 burners have proven to be the optimum size for HLT and BK applications, and with low pressure hit 80K at wide open.
To implement spark ignition with pilot you need 2 solenoids and 1 spark ignition module for each burner. The correct 1/4" solenoids rated for gas use are ASCO RED-HAT-8262H078, and run $75 each. The S8610 spark module runs around $88 each, for a total of $238 a burner. The Y8610U kits run around $210 and have a low pressure valve included, but you will need a Q345 pilot burner as they only have conversions for the Q314 pilot burners but no Q314 pilot burner. You do not need solenoid valves larger than 1/4" with high pressure, the gas density is such that they will flow more than the #65 drill size orifice can pass at the burner, larger is wasting your time and money.
For an example of this with diagrams, check the "Soos Creek Brewery thread
https://www.homebrewtalk.com/f51/1-bbl-brewery-build-brutus-inspired-307647/ as there is an implementation of high pressure burner control for propane.
If you want the lowest cost and most popular setup, the Honeywell VR8200 low pressure standing pilot valve, Q314 pilot burner, and thermocouple will run about $80 per burner. Light pilot at start of brew session and away you go.