8k rpm ...

Ok, don't beat me up on this one. No I don't race, I know it's completely impractical .... thinking of rebuilding the engine in my 70 340 swinger in the near future. Will be putting the #'s matching engine in the corner of the garage, I have a complete stock bore 71 340 that I'd build. My problem, I want 8k rpm. Want to build a fun, high revving engine for around town pleasure. Not sure why 8k stands out to me but it just does . My question is, how attainable is this and how much work are we talking about so I don't worry about sending shrapnel outside the engine block everytime I get on it ?
No I don't race. you answered the question yourself. It is not practical to build an 8000 rpm 340 street motor.
The cylinder head and camshaft needed to make power at 8000rpm makes it a RACE motor.
Why build a sewing machine for the street. That's a Chevy small block thing.
6800 -7000rpm 340 will be more than enough for the street and monetarily and practical to build.