Ask for community.

@jopaslona I would recommend nuclear engines with liquid hydrogen then. It will get you a high amount of delta-v and lower weight, although the TWR might not be higher than 1, although as you said this craft is not taking off from the surface so it should work well in space. I made a very extreme craft with 13 max size (50x25) fuel tanks and about 30 nuclear engines, this had low TWR but the delta-v was high at 18k.

@KraZIvan 7k+ delta-V cause i need to far journey

I think you can get it to have less mass by using nuclear engines & liquid hydrogen, and should have a decent amount of delta-v. Is it a must that your craft be that heavy? (At 270 000 tons that sounds like a generation ship). What is the delta-v number you want to be at?

@KraZIvan this not for launch from Droo, i mean this thing its like space station and i need to have more Delta-V for Interstellar flights cause im play with mod for more planets, the TWR can be under 1, but i still need many Delta-V. I try to make it smaller and now i have 27 million kilogrammes in full complication without docked parts, i need to now how to get much Delta-V, i wont tu launch it full complicated, ill be piecing it together on orbit.

How many stages is your craft? Are you looking for 7-10 mins burn time of the first stage? If so I would suggest splitting the 1st stage into 2 stages (each with 3 mins burn time) but depending on your set up 7-10 minites burn sounds high. Maybe try adding SRBs to the first stage as well.