I need a couple of 850's for a tunnel ram application. 500 inch hemi, unported heads, .600 flat tappet, street/strip deal. Summit list two 850's. Not sure of the differences. Can anyone tell me which is better suited? I realize it will need changes either way.

https://m.summitracing.com/parts/hly-0-9380

https://m.summitracing.com/parts/hly-0-4781c

The choke/no choke is the only difference I notice