Fuel starve

Thanks to all for your feed backs. Very useful !
I will check those points next week end if possible . Here below also a few answers :

-engine is stock ( rebuilt with oversize bore as it was completely blocked when i got the car )
- X head ( original )
- Carburetor is a rebuilt carter avs ( uremco )
- mechanical fuel pump ( replaced by a new oen from Crown )
- filter : horizontal located as per stock mounting
- new gas tank and sending unit set
- TTI exhaust line and schumacher headers

I will post a few pics

regarding now how i analysed The issue :
- no problems when driving Above 30mph
- problems start when engine si hot and i am in a traffic jam or when Manoubering to park : low rpm , engine will stop
- the plastic filter will show to Be low level insude and i will need to run The starter for like 20 sec prior to get fuel back in the filter And to get teh engien running again
- But the filter si never totally empty , which open teh door to the fuel possibility
- in fact this does not happen when i have the engine cold And i leave the car