Re-jet Holley 2-barrel for 305 to 350 vortec swap

[kgkern01]

Last summer my 215hp Volvo Penta 5.0 GL vortec bit the dust due to valve spring failure. I've now swapped it out for a 275hp 350 vortec long block. I plan on upgrading to a 4-barrel carb later, but just to get back on the water for the summer I'm planning on re-using the 2-barrel Holley carb that was on the 305 and just re-jet it for the 350 until I can afford to upgrade to the 4-barrel.
My question is this, what jet sizes should I upgrade to for going from 305 to the 350? I can't seem to find any information online unfortunately, even though the Volvo Penta 5.7 came with same optional with the same Holley 2-barrel as the 5.0, just larger jets I'm sure.

Thanks in advance.

 

[alldodge]

Unable to find jets on the VP site, but did find them for the Merc 2BBL carb on BAM site. Both the 305 and 350 for 1998 to 2001 list the same main and power jet numbers

Main 3302-9058
Power 3302-9059

You could use your current carb, and try different rpms, then stop quickly and pull plugs

Could also contact Holley and they should be able to tell you what changes would be needed if any

 

[kgkern01]

Thanks, I appreciate the help. Usually I'm pretty good at locating this kind of info online, but didn't have much luck this time. My 305 always ran pretty rich, I'll try running it as is, keep an eye on the plugs during break in, since I shouldnt be turning higher RPM until after break in anyway.

 

[Scott Danforth]

if your 305 ran rich, check the power valve in the event it is ruptured.

 

[kgkern01]

Yeah I'm going to rebuild the carb before I put it on the new engine, either tonight or tomorrow.

 

[shabs1986]

9.5 power valve instead of 8.5