Looking for advice on a blueprint engine.

I'm late to the game on this one! I have seen pump gas and octane and compression being mentioned a few times, and that's exactly where my opinion lies also. The 396 likes 93 or better. On paper it's only a touch higher than the 400, but it does like 93 vs 91. Some areas of the country, where fuel composition seems to vary, we even recommend our octane booster on the 396.
BluePrint Engines TrueBlue Performance Octane Booster

The 400 runs On 91 all day and guys love them.

Don't get me wrong, the 396 is a cool engine, but it really only came to exist because way back when we only had oem blocks, it was the way to make more hp and get more cid. Once our new BPE blocks came to be, the 400 was just the next rendition of 500 hp and a big ish cube sb With its bore size of 4.125.

So today my vote is the 400. Or if you do go 396. Grab some of that octane boost with it to be safe. Both are great engines, the 400 just wins for me being it'll be in the lineup for a long time.

Any questions, give me a call or a pm. Or keep posting here. Whatever works! Thanks for the considerstion!