rocker and pushrod question

[mopargocar]

Just went through a 71 340 with the iron 202/160 J heads. Lunati Voodoo 268 flat tap cam. If I use old school adjustable rockers off a 273 what length pushrods would I need?

 

[Snake]

I would think the stock 273 will work.

 

[mikedevore]

The 273 rocker might hit the spring, may have to grind them to clear.