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I've got a call out match against a guard force that most likely will be:
2 demolishers
2 MBTs
1 pask punishers
4 grenadier squads in chimeras
2 grenadier squads in valkyries
a vulture
deathstrike
and some other stuff like death korps rough riders:

The opponent got to pick which of my regular lists they wanted to deal with. He choose a list which is vaguely

CSM CAD:
Belakor
Juggerlord
2-4 cultist squads
2 Heldrakes
Chaos spawn

Khornate CAD:
2 bloodthirters
2-3 bloodletter squads
A Bloodcrusher squad
Soulgrinder
Vengeance battery with barricades

I can't radically alter the list, but things like tweaking it lightly (I have fireraptor, a Khorne herald, at least one unit of everything CSM (codex not FW) most likely two) or swapping out a couple units here and there is allowed.

So, what changes to the list? What loadouts in the units?

With that lightly altered list, what are some good tactics? I see myself losing this battle trying to get to the enemy gunline.

if you get to pick the terrain, trick him to castle up in a corner with line of sight blocking terrain as you Islands hop from cover to cover. Don't give him multi tier ruins for him to climb on. Use solid impassable terrain like rocks. This plan fails if he has basilisk or other blast weaponry that does not need direct sight.

deep striking raptor will murder rear armor on IG tanks. just saying.

don't underestimate pask punisher. he should be dealt with early game, and keep your distance.

vultures with punishers are also awesome units. watch out for that.