Is that budget entirely for the engine build? Because that works out to a max of about $9000 US.

Which is a lot of money for a 383 rebuild.

I don't know what pr9cves are like in Europe but that would be a monster build here. A complete 440source stroker kit is $2249, rods, pistons, crank, bearings all balanced and ready to install,.

Another $1000 gets you a pair of all new aluminum cylinder heads.

That's less than half your budget and most of the hard parts done and new.